Tire valve



`uly l?, 1923.

w. E. coPn-HORN TIRE VALVE Filed July 15, 1920 Irv/e nTor: WaHer' E'. Copiihorrf, ma

Patented July 17, 1923..

; v STATES PATENT oFFlcs.

y WALTER E. COPITHRN, OF NATICK, MASSACHUSETTS.

TIRE VALVE.

Application led July 15, 1920. Serial No. 396,381.

,Naticln county of Essex, State of Massachusetts, have invented an Improvement in f Tire Valves, of which the following descriplso tion, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates to valves for pneumatic tires and particularly to that type of valve which is provided with means for positively clamping it tothe seat. The object of the invention is to provide an improved valve of this type which is simple in its construction; which can bev easily manipulated, and which has other features, all as will be more fully hereinafter set forth.

In order to give an understanding of my' invention, I have illustrated inthe drawings some selected embodiments of the .invention which will now be described', after which the novel features will bepointed out in the appended claim. f y

In the drawings, Fig. 1 is a longitudinal sectional view through a valve embodying my invention;

Y Fig. 2 is an enlarged section on the` line 2,-2, Fig. 1;

Fig. 3 is an enlarged sectionon the line 3 3, Fig. 1;

Fig. 4 is a section on the line 4-4,Fig. 1;

Fig. 5 is an enlarged sectional lview through the valve chamber and valve stem showing the manner in which a tight joint is made;

Fig. 6 is a modification of the invention.

My invention can be applied to the ordinary valve stem or may be embodied in a valve structure having a specially-constructed valve stem. In Figs. 1 to 3, I have shown it as it might be 4applied to the valve stem constructed to receive the ordinary Schrader valve.

1 indicates the valve stem which is provided with thenduct or bore 2 and which has at its outer end the internally screwthreaded recess or bore 3 in which the valve is usually received. This valve stem is also provided with the reduced externally screwthreaded end 21 which is adapted to'receive the pump connection and with an externa shoulder 4. f

My improved valve comprises a valve casing 5 which is constructed to screw into the screw-threaded bore 3 and is formed at its end with a head 6 arranged to engage the end of the valve stem 1. This head 6 is preferably non-circular in shape, as shown in Fig. 4, so that a wrench or suitable implement may be applied thereto for removing the valve casing or inserting itl into place. l

The underside of the head' is provided with a facing 41 of soft metal orsome other suitable packing for the purpose of making a tight joint with the end of the valve stem when the valve casing is screwed rmly into place. This valve casing is provided with an interior valve chamber 7, with a conical valve seat 8 at one end of the chamber, and

with a duct 9. The valve is shown -at'10, and ithas a conical shape to fit the valve. seat 9, andthe conical portion thereof will preferably `be provided with an insert 11 of soft metal which engages .the valve seat 8 and makes a tight joint therewith. This valve is shownfasmountedon a central rod or support' 12, one end 13 of which is screwthreaded and extends through the bore 9 and beyond the valve casing 6 kwhen the valve is seated. This supporting rod 12 eX- tends below the valve 10 and the end 14 thereof is flattened and occupies a slot4 42 formed in a cap piece 15 which is secured tothe end of the valve casing 5. This cap piece 15 is shown as having the circular flange 16 which lits the interior of the casing with a tight fit and is thus frictionally he d in place. 17 is a spring encircling the supporting rod 12 and confined between the cap 15 and the valve, said spring yieldingly holding the valve to itsseat.

18 is a cap rwhich is adapted to embracey the end of the valve stem and to rest against the shoulder 4 thereof. This cap has a bridge piece 19 provided with a screw- 'threaded aperture of a size to fit the screwthreaded portion 13 of the supporting rod. The cap is also formed in its outer end with a recess 20 having a shape to fit the head 6 kof the valve casing, thus enabling the cap to be used asa wrench for removing the vvalve casing or inserting it in place. When the cap 18 is removed the tire may be pumped up in usual way by attaching Lthe pump connection to the portion 21 of the valve stem. When the tire is properly inated, then the cap 18 is placed over the end.

of the valve stem and is screwed to the end 13 of the valve rod. `IYVheIl the end of the cap engages the shoulder 4,t he11 any further turning movement of said cap Will dravv the valve tightly *to the seat 8 vand thus make a perfectly 'tight non-leaking joint. During this operation the valve is prevented from turning by the flattened end le Which isreceived in a slot formed in the cap l5. Then the cap 18 is removed, then the recess 2d thereof constitutes a Wrench for removing the valve casing 5 or inserting `it in place.

In Fig. 6 I have shown an embodiment of the invention wherein the valve is applied to "a valve 'stem 50 o'f special construction, said 'valve stem being 'of substantially uniform diameter throughout. ln this embodim'e'nt the bore 3 for receiving the 'valve casing can be larger than is possible in the construction shown in Fig. l. ,This enables a larger 'valve to be used Which has the advantage that the tire can be more rapidly fpump'e'd up than Where ythe valve is a relatively 'small one. With the vconstruct-ion 'shown in Fig.l 6 a special pump connection vvould-have lto be employed because of the increased size of the screw-'threaded end of the valv'e stem to which lthe pump is atta'ched.` y

`Tn the construction shown in Fig. 6 the nut element 51 ywhich is screw-threaded "to i the end t3 of the valve rod lis shaped so that *it rests against the end of Ethe valve stein 50 4"instead 'of vagainst shoulder ii, as shown in Fig. l.. -n other respects, the invention sho'vvn -in Fig. 6 'is similar to that shown in Fig. 1.

indicates a dust cap which may be screw-threaded to the valve stem kto enclose the valve structure as usual in devices of this sort.

Gil indicates a portion of the felly of a wheel Which is equipped with a pneumatic tirer having my improved valve and 62 is the usual lock nut which is screw threaded te the valve stem and engages the inside of the Wheel felly. w

I claim;

ln a tire valve, the combination With a valve stem having an interiorly Vsc'revvthreaded 'bore and an external shoulder, ofka valve casing screw-threaded into said bore and provided with a conical valve seat, said easing having a non-circular head Which against the end of the valve stem, a spring` pressed valve Within the casing engaginf said seat, said valve having a 'screwethreaded rod or projection extending therefrom through and beyond the casing, and a cap adaptedto seat against the shoulder of the valve stem and having screw-'threaded engagement with said projection, whereby when the cap is turned the valve Will fbe firmly forced against its seat, said cap having a recess to lit the non-circular end'of the casing and thus constituting a vWrench for ieirioving the casing from the 'valve stem. n A

n testimony whereof l have signed my name to this specification.'

DR. WALTER n. c'oriTHoRN 

